The invention provides a 
pesticide application device for preventing and treating soybean 
root rot, relates to the technical field of 
pesticide application devices, and solves the problems that an existing 
pesticide application device is relatively simple in structure and single in functionality, the 
pesticide application device comprises a pesticide 
barrel, one side of the bottom end of the pesticide 
barrel is provided with a hose through a fixing piece, and the other end of the hose is connected with a 
pesticide application rod; a semicircular pesticide applying frame is installed at the other end of the pesticide applying rod, a plurality of pesticide applying flow guide 
pipe mechanisms are installed at the bottom end of the semicircular pesticide applying frame, each pesticide applying flow guide 
pipe mechanism comprises a 
pipe body, a pair of supporting rods is arranged in the pipe body, a transmission shaft rod is installed on the supporting rods through miniature bearing seats, and a plurality of fixing seats are installed on the transmission shaft rod at equal intervals; 
spiral blade rods are obliquely and symmetrically installed on the fixing base, and miniature brushes are installed at the 
tail ends of the 
spiral blade rods. The device is novel in design, simple in structure and worthy of wide application and popularization.